US8365382B2 - Method of forming a clamping ring and a clamping ring - Google Patents

Method of forming a clamping ring and a clamping ring Download PDF

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Publication number
US8365382B2
US8365382B2 US12/667,453 US66745307A US8365382B2 US 8365382 B2 US8365382 B2 US 8365382B2 US 66745307 A US66745307 A US 66745307A US 8365382 B2 US8365382 B2 US 8365382B2
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Prior art keywords
pipe
clamping ring
pipe part
widening
extruded
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US20100199469A1 (en
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Bengt Hedström
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Uponor Innovation AB
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Uponor Innovation AB
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/001—Pipes; Pipe joints
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
    • F16L13/14—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/20—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics
    • F16L47/22—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics using shrink-down material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/22—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes
    • B29C55/24—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes radial
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • B29C57/02—Belling or enlarging, e.g. combined with forming a groove
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/66—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/66—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined
    • B29C65/68—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by liberation of internal stresses, e.g. shrinking of one of the parts to be joined using auxiliary shrinkable elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5224—Joining tubular articles for forming fork-shaped connections, e.g. for making Y-shaped pieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0691—PEX, i.e. crosslinked polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/24—Condition, form or state of moulded material or of the material to be shaped crosslinked or vulcanised
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2305/00—Use of metals, their alloys or their compounds, as reinforcement
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/44—Clasp, clip, support-clamp, or required component thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/44—Clasp, clip, support-clamp, or required component thereof
    • Y10T24/44983—Clasp, clip, support-clamp, or required component thereof formed from single rigid piece of material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49789—Obtaining plural product pieces from unitary workpiece
    • Y10T29/49798—Dividing sequentially from leading end, e.g., by cutting or breaking
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49909—Securing cup or tube between axially extending concentric annuli
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49909—Securing cup or tube between axially extending concentric annuli
    • Y10T29/49911—Securing cup or tube between axially extending concentric annuli by expanding inner annulus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49909—Securing cup or tube between axially extending concentric annuli
    • Y10T29/49913—Securing cup or tube between axially extending concentric annuli by constricting outer annulus

Definitions

  • the invention relates to a method of forming a clamping ring, the method comprising: extruding a pipe from a plastic material having memory properties, and cutting the extruded pipe to form a pipe part.
  • the invention relates to a clamping ring that is formed from an extruded pipe by cutting the pipe into a short enough pipe part.
  • a clamping ring made of elastic material which may be the same plastic material as that from which the pipe is made, is expanded and shrunk over the pipe end, in order to further enhance the holding and sealing pressure at the pipe connection region.
  • the clamping ring is expanded at the same time as the pipe-end is expanded, with the clamping ring in position around said pipe-end.
  • Such a solution has been disclosed for example in EP 0 530 387.
  • EP 0 530 587 the clamping ring has been made from an extruded pipe by cutting the pipe into a short enough part to form a clamping ring.
  • EP 1 741 968 the clamping ring is made by injection molding.
  • the object of the invention is to provide a new method of forming a clamping ring and a new clamping ring.
  • the method of the invention is characterized by warming the pipe part and bending the end of the pipe part such that a clamping ring having a stop edge is formed.
  • clamping ring of the invention is characterized in that the end of the pipe part is bent such that the end of the pipe part forms a stop edge in the clamping ring.
  • a pipe is extruded.
  • the extruded pipe is cut to form a pipe part.
  • the pipe part is warmed and the end of the pipe part is bent.
  • the pipe part forms a clamping ring and the bent end of the pipe part forms a stop edge in the clamping ring.
  • the bending of the end of the pipe part is performed by widening the body part of the pipe part and preventing the end of the pipe part from widening. It is simple and easy to make such a clamping ring.
  • the clamping ring is simple it is provided with a stop edge. The stop edge ensures that the clamping ring remains positioned at a correct position on the pipe end when a pipe connection is being made and after the pipe connection has been made.
  • FIG. 1 schematically shows a pipe connection in cross-section
  • FIGS. 2 , 3 , 4 , 5 , and 6 are schematic cross-section of views showing different stages of a method of forming a clamping ring.
  • FIG. 1 shows a pipe 1 , which is comprised of a plastic material having memory properties, for instance a cross-linked polyethylene PEX or any other cross-linked polyolefin, and a connecting piece 2 made of metal.
  • the connecting piece 2 comprises a nipple end 3 .
  • the nipple end 3 comprises radially projecting flanges 4 .
  • the nipple end 3 is terminated with a radial abutment surface 5 .
  • the nipple end 3 has an outer diameter which exceeds the inner diameter of the unexpanded pipe 1 .
  • An elastic clamping ring 6 is mounted on an end of the pipe 1 . In its relaxed state, the clamping ring 6 has an inner diameter which corresponds to the outer diameter of the unexpanded pipe 1 .
  • the end of pipe 1 and the surrounding clamping ring 6 are expanded simultaneously by an expander tool.
  • the nipple end 3 is then immediately inserted into the end of the pipe until the abutment surface 5 is in abutment with the end of the pipe 1 and with the clamping ring 6 .
  • the end of the pipe 1 and the clamping ring 6 then shrink or contract automatically, so as to obtain a sealing contact between the inner surface of the pipe and the flange in particular.
  • the sealing contact is also obtained between the inner surface of the pipe 1 and the outer surface of the nipple end 3 .
  • FIGS. 2 to 6 show the steps of forming a clamping ring.
  • a pipe is extruded.
  • the pipe is made from cross-linked polyethylene PEX or any other plastic material having memory properties.
  • the pipe is then cut into a short enough part to form a clamping ring, such that a pipe part 7 shown in FIG. 2 is formed.
  • the pipe part 7 is warmed up at a temperature of 135° C.-150° C.
  • the pipe part 7 is positioned into a mold as shown in FIG. 3 .
  • the mold comprises a collapsible cylinder 8 which is positioned inside the pipe part 7 and an outer mold 9 .
  • the pipe part 7 can be warmed up, for example, in the mold.
  • the collapsible cylinder 8 is in its collapsed state.
  • the pipe part 7 is expanded with the collapsible cylinder 8 as shown in FIG. 4 .
  • the length of the cylinder 8 is somewhat shorter than the length of the pipe part 7 .
  • the length of the cylinder may vary from 2 to 5 cm, for example, when the diameter of the pipe part 7 varies from 2 to 5 cm, for example.
  • the length of the pipe part is for example 3 to 10 mm longer than the length of the cylinder 8 .
  • the cylinder 8 expands the body part 6 a of the pipe part 7 , whereas the end 6 b of the pipe part 7 remains unexpanded.
  • the outer mold 9 prevents the end 6 b of the pipe part 7 from widening.
  • the end 6 b of the pipe part 7 forms a stop edge 10 as shown in FIG. 6 .
  • FIG. 5 describes cooling of the pipe part 7 to a temperature of approximately 20° C.
  • FIG. 6 describes opening of the mold when the clamping ring 6 with the stop edge 10 is ready.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

A pipe from a plastic material having memory properties is extruded. The extruded pipe is cut to form a pipe part (7). The pipe part (7) is warmed and the end (6 b) of the pipe part (7) is bent. The pipe part (7) forms a clamping ring (6) and the bent end (6 b) of the pipe part (7) forms a stop edge (10) in the clamping ring (6).

Description

CROSS-REFERENCE TO RELATED APPLICATIONS
This application is the National Stage of International Application No. PCT/IB2007/052555, filed on Jul. 2, 2007. The contents of the application is hereby incorporated by reference in its entirety.
BACKGROUND OF THE INVENTION
The invention relates to a method of forming a clamping ring, the method comprising: extruding a pipe from a plastic material having memory properties, and cutting the extruded pipe to form a pipe part.
Further, the invention relates to a clamping ring that is formed from an extruded pipe by cutting the pipe into a short enough pipe part.
It is known to provide a pipe connection between one end of a pipe made of a plastic material that has memory properties and a connecting piece. The memory properties mean that plastic pipes with a memory capacity automatically strive to return essentially to their original shape and form after having been expanded. For example plastic pipes that are manufactured from cross-linked polyethylene possess an active memory capacity at temperatures as low as room temperature. Pipes of this nature are joined together by widening one end of the pipe and inserting into the widened pipe-end a flanged connector which forms a part of the pipe connecting piece, normally made of metal, and which is retained in said pipe-end until the pipe has shrunk to an extent at which it is able to firmly hold the connecting piece. A clamping ring made of elastic material, which may be the same plastic material as that from which the pipe is made, is expanded and shrunk over the pipe end, in order to further enhance the holding and sealing pressure at the pipe connection region. The clamping ring is expanded at the same time as the pipe-end is expanded, with the clamping ring in position around said pipe-end. Such a solution has been disclosed for example in EP 0 530 387. In EP 0 530 587 the clamping ring has been made from an extruded pipe by cutting the pipe into a short enough part to form a clamping ring. In EP 1 741 968 the clamping ring is made by injection molding.
BRIEF DESCRIPTION OF THE INVENTION
The object of the invention is to provide a new method of forming a clamping ring and a new clamping ring.
The method of the invention is characterized by warming the pipe part and bending the end of the pipe part such that a clamping ring having a stop edge is formed.
Further, the clamping ring of the invention is characterized in that the end of the pipe part is bent such that the end of the pipe part forms a stop edge in the clamping ring.
In the invention a pipe is extruded. The extruded pipe is cut to form a pipe part. The pipe part is warmed and the end of the pipe part is bent. The pipe part forms a clamping ring and the bent end of the pipe part forms a stop edge in the clamping ring. Preferably, the bending of the end of the pipe part is performed by widening the body part of the pipe part and preventing the end of the pipe part from widening. It is simple and easy to make such a clamping ring. Although the clamping ring is simple it is provided with a stop edge. The stop edge ensures that the clamping ring remains positioned at a correct position on the pipe end when a pipe connection is being made and after the pipe connection has been made.
BRIEF DESCRIPTION OF THE FIGURES
In the following, the invention will be described in greater detail by means of preferred embodiments with reference to accompanying drawings, in which
FIG. 1 schematically shows a pipe connection in cross-section, and
FIGS. 2, 3, 4, 5, and 6 are schematic cross-section of views showing different stages of a method of forming a clamping ring.
 DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a pipe 1, which is comprised of a plastic material having memory properties, for instance a cross-linked polyethylene PEX or any other cross-linked polyolefin, and a connecting piece 2 made of metal. The connecting piece 2 comprises a nipple end 3. The nipple end 3 comprises radially projecting flanges 4. The nipple end 3 is terminated with a radial abutment surface 5.
The nipple end 3 has an outer diameter which exceeds the inner diameter of the unexpanded pipe 1. An elastic clamping ring 6 is mounted on an end of the pipe 1. In its relaxed state, the clamping ring 6 has an inner diameter which corresponds to the outer diameter of the unexpanded pipe 1.
When establishing the pipe connection shown in FIG. 1, the end of pipe 1 and the surrounding clamping ring 6 are expanded simultaneously by an expander tool. The nipple end 3 is then immediately inserted into the end of the pipe until the abutment surface 5 is in abutment with the end of the pipe 1 and with the clamping ring 6. The end of the pipe 1 and the clamping ring 6 then shrink or contract automatically, so as to obtain a sealing contact between the inner surface of the pipe and the flange in particular. The sealing contact is also obtained between the inner surface of the pipe 1 and the outer surface of the nipple end 3.
FIGS. 2 to 6 show the steps of forming a clamping ring. First, a pipe is extruded. Preferably the pipe is made from cross-linked polyethylene PEX or any other plastic material having memory properties. The pipe is then cut into a short enough part to form a clamping ring, such that a pipe part 7 shown in FIG. 2 is formed.
The pipe part 7 is warmed up at a temperature of 135° C.-150° C. The pipe part 7 is positioned into a mold as shown in FIG. 3. The mold comprises a collapsible cylinder 8 which is positioned inside the pipe part 7 and an outer mold 9. The pipe part 7 can be warmed up, for example, in the mold. In FIG. 3 the collapsible cylinder 8 is in its collapsed state.
The pipe part 7 is expanded with the collapsible cylinder 8 as shown in FIG. 4. The length of the cylinder 8 is somewhat shorter than the length of the pipe part 7. The length of the cylinder may vary from 2 to 5 cm, for example, when the diameter of the pipe part 7 varies from 2 to 5 cm, for example. The length of the pipe part is for example 3 to 10 mm longer than the length of the cylinder 8. Thus, the cylinder 8 expands the body part 6 a of the pipe part 7, whereas the end 6 b of the pipe part 7 remains unexpanded. The outer mold 9 prevents the end 6 b of the pipe part 7 from widening. Thus, the end 6 b of the pipe part 7 forms a stop edge 10 as shown in FIG. 6.
FIG. 5 describes cooling of the pipe part 7 to a temperature of approximately 20° C.
FIG. 6 describes opening of the mold when the clamping ring 6 with the stop edge 10 is ready.
It is obvious to a person skilled in the art that in the course of technical progress, the basic idea of the invention may be carried out in numerous ways. Thus, the invention and its embodiments are not limited to the previous examples, but they may vary within the scope of the appended claims.

Claims (3)

1. Method of forming a clamping ring, the method comprising:
extruding a pipe from a plastic material having memory properties,
cutting the extruded pipe to form a pipe part, warming the pipe part and bending the end of the pipe part such that a clamping ring having a stop edge is formed, wherein the bending of the end of the pipe part is performed by widening the body part of the pipe part and by preventing the end of the pipe part from widening.
2. A method according to claim 1, wherein
the widening of the body part of the pipe part is made by means of a collapsible cylinder positioned in the pipe part, the length of the cylinder being shorter than the length of the pipe part.
3. A method according to claim 2, further comprising
positioning an outer mold on the pipe part before widening the body part of the pipe part.
US12/667,453 2007-07-02 2007-07-02 Method of forming a clamping ring and a clamping ring Active 2028-07-15 US8365382B2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2007/052555 WO2009004407A1 (en) 2007-07-02 2007-07-02 Method of forming a clamping ring and a clamping ring

Publications (2)

Publication Number Publication Date
US20100199469A1 US20100199469A1 (en) 2010-08-12
US8365382B2 true US8365382B2 (en) 2013-02-05

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US12/667,453 Active 2028-07-15 US8365382B2 (en) 2007-07-02 2007-07-02 Method of forming a clamping ring and a clamping ring
US13/599,197 Abandoned US20120324681A1 (en) 2007-07-02 2012-08-30 Method of forming a clamping ring and a clamping ring

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US11054076B2 (en) 2016-11-04 2021-07-06 Zurn Industries, Llc Reinforcing ring with sleeve
US11371634B2 (en) 2017-01-05 2022-06-28 Life Technologies Corporation Compression collars for coupling a tube to a tube fitting and methods of use
US11543065B2 (en) 2016-09-02 2023-01-03 Zurn Industries, Llc Extruded cold-expansion compression collar
US11541581B2 (en) 2016-09-02 2023-01-03 Zurn Industries, Llc Injection molded cold-expansion compression collar

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EP2481966A1 (en) * 2011-02-01 2012-08-01 Uponor Innovation AB Clamping ring
CN103707499A (en) * 2013-12-17 2014-04-09 安东石油技术（集团）有限公司 Opening flattening die
CN107696390B (en) * 2017-11-01 2019-07-12 乐清市东博机电有限公司 A kind of method manufacturing clamping ring and its manufacture the equipment of clamping ring, injection molding machine
EP4197749A1 (en) 2021-12-16 2023-06-21 Auray Managing, S.L. Clamping ring and method of forming the same

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Publication number Priority date Publication date Assignee Title
US11543065B2 (en) 2016-09-02 2023-01-03 Zurn Industries, Llc Extruded cold-expansion compression collar
US11541581B2 (en) 2016-09-02 2023-01-03 Zurn Industries, Llc Injection molded cold-expansion compression collar
US11054076B2 (en) 2016-11-04 2021-07-06 Zurn Industries, Llc Reinforcing ring with sleeve
US11371634B2 (en) 2017-01-05 2022-06-28 Life Technologies Corporation Compression collars for coupling a tube to a tube fitting and methods of use
US11821554B2 (en) 2017-01-05 2023-11-21 Life Technologies Corporation Compression collars for coupling a tube to a tube fitting
US11821553B2 (en) 2017-01-05 2023-11-21 Life Technologies Corporation Methods of using compression collars for coupling a tube to a tube fitting

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US20120324681A1 (en) 2012-12-27
EP2170583A1 (en) 2010-04-07
DK2170583T3 (en) 2013-12-16
EP2170583B1 (en) 2013-09-04
ES2435781T3 (en) 2013-12-23
CA2691616A1 (en) 2009-01-08
PL2170583T3 (en) 2014-03-31
US20100199469A1 (en) 2010-08-12
CA2691616C (en) 2014-05-13
EP2170583A4 (en) 2011-01-05

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